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SOCKET 0R HOLDER FOR INUANDESGENT LAMPS. No. 320,026. Patented June 16,1885.

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. I NITED STATES rrIcE.

ATENI EDWARD WESTON, or N WAEmNEw'JEEsEY, ASSIGNOR TO THE UNITED STATESELECTRIC LIGHTING COMPANY, OF NEW YORK, N. Y.

SOCKET OR HOLDER'FOR INCANDESCENT LAMPS.

SPECIFICATION forming part of Letters Patent No. 320,026, dated June 16,1885.

Application filed October 20, 1884.

To all whom it may concern:

Be it known that I, EDWARD WESTON, a subject of the Queen of Great.Britain, and a resident of Newark, in the county of Essex and State ofNew Jersey, have invented certain new and useful Improvements in Socketsor Holders for Incandescent Lamps, of which the following is aspecification; reference being had to the drawings accompanying andforming a part of the same.

The subject of a patent granted to the United States Electric LightingCompany as my assignee, May 6, 1884, No. 298,142, is a holder forincandescent lamps, in which terminal contact springs are arranged in asocket, and the lamp is supplied with a cylindrical base, carryingcontact plates that encounter the springs when the lamp is placed in theholder. The base of the lamp has projections that fit under the flangedrim of the socket and serve to hold the lamp in position. I haveelsewhere shown other forms of locking device for holding the lamp inthe socket against the force of the springs, the objects in all being,however, the same, to secure good electrical contacts and to prevent thelamp from becoming detached from the holder or from being injured in anyway when removed by unskilled persons.

7 My present invention consists in another, and in some respects animproved, form of locking device, capable of application, generally, tovarious forms of socket or holder, but more particularly to the specialform above described. I shall describe it, therefore, in connection withthis socket by reference to the accompanying drawings.

Figure 1 is aviewin elevation and part vertical section of a holder.Fig. 2 is a section on line as a; of Fig. 1. Fig. 3 is an end view ofthe lamp-base, and Fig. 4 a plan of the socket.

As the main portions of the device differ in no essential particularfrom those shown in the .patent referred to, and in applications filedby me, they may be described briefly as consisting of a cylindricalcase, A,containing a switch, for which B is the handle or key, and acase, 0, above this, which forms the socket proper. In this latter is arecessed plate or cup of insulating material, D, with an c ien- (Nomodel.)

ing through its center. To the under side of plate D, or within therecess, is secured a flat spring, E, connected with one of theswitchwires and extending over the perforation in the plate. To theupper side of plate D is 5 fixed an arc-shaped spring, ,F, concentricwith the perforation and connected with the other switch-wire. To theneck of the lamp is attached, by plaster-of-paris or otherwise, acylinder, G, of either metal or insulating material. Its end is closedby a plug, H, of wood, from the center of which extends a pin, K. Thelamp-Wire's are carried down through this plug, one through the pin orprojection K to a plate, a, carried thereby, the other to a circularplate, 6, around the projection.

When the base of the lamp is inserted in the socket, the projection Kpasses through the perforation in plate 1), bringing plate a in contactwith spring E and plate I) in contact with spring f. The force of thesesprings,however, tends to lift the lamp out of the socket, and thespecial means which I employ for preventing this is the subject of mypresent invention. To this end I inserttwo pins,c c,in the sides of thecylinder or socketO as near to the upper edge as practicable, and theupper edge of the cylinder G, surrounding the neck of the lamp, is spunover to form a bead or rolling flange, L. At diametrically oppositepoints, corresponding to the position of the pins 0, this flange or beadis cut away, as at d, and at two other points indentations e are'formedin the under side of the flange.

In inserting the lamp in the socket it is placed so that the pins 0enter the flange through the notches (Z, and the lamp is then turneduntil the pins are brought into the indentations 6. By this means thelamp is firmly held against accidental displacement, and good electricalcontact maintained However the flange on the cylinder G may be formed isimmaterial, although it is most convenient to simply turn or spin it inthe manner and form described. 9

What I claim is 1. Thecombinatiomwith a socket or holder containingcontacts and having pins '0 c on its sides, of an incandescent lamp andbase-carrying terminals, and having a notched flange I with which thepins engage when the base is lindrical base-carrying terminals, andhaving inserted in the socket, as and for the purpose specified.

2. The combination, with a socket or holder containing spring-contactsand having pins 0 0 on its sides, of an incandescent lamp andbase-carrying terminals, and having a notched flange with which the pinsengage when the base is inserted in the socket, as set forth.

3. The combination,with a socket or holder containing spring-contactsand having pins 0 c on its sides, of an incandescent lamp and cyitsupper edge or rim formed as a bead or flange containing notches andindentations so I 5 formed that when the base is inserted in the socketthe pins thereon may enter the flange and rest in the indentations, asdescribed.

In testimony whereof I have hereunto set my hand this 15th day ofOctober, 1884.

EDWARD WESTON. Witnesses:

H. A. BECKMEYER, M. M. GARVER.

